Draft-equalizer for tubular boilers.



T. J. KENNEDY.

DRAFT EQUALIZER FOR TUBULAR BOILERS.

APPLICATION FILED FEB. 2c, 1913.

1,105,798. Patented Aug. 4, 1914.

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THE NORRIS PETERS CO, PHOTO-LITHO.. WASHINGTON, D. k

. the boiler just below a means wherebythis situation may be over- THQMAS J. KENNEDY, 0F STOCKTON, CALIFORNIA.

DRAFT-EQUALIZER FOR TUBULAR BOILERS.

Specification of Letters Patent.

Application filed February 26, 1913., Serial No. 750,777. 1

To all whom it may concern a Be it known that I, THOMAS J. KENNEDY, a citizen of the United States, residing at Stockton, county of San Joaquin, State of California, have invented certain new and useful Improvements in Draft-Equalizers for Tubular Boilers; and I do declare the following to be a clear, full, and exact de scription of the same, such as will enable others skilled in:the art to which, it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this application.

This inventionrelates to improvements in tubular boilers and particularly to a draft equalizer therefor.

In boilers now commonly in use the draft caused by the vacuum in the breeching of the smoke stack is such that it draws most of the draft through the upper tubes ofthe boiler and ordinarily the lower tubes are most entirely inactive and it is the aim of my invention to produce come and the draft equalized so as to cause all the tubes to be in operation.

A. further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly effective for the purposes for which it is designed.

These objects, I accomplish by means of such structure and. relative arrangement of the parts as will fully appear by a perusal of the followingspecification and claim.

The figure in the drawing is a side elevation of a boiler showing the breeching in section to illustrate my improved structure. Referrlng now more particularly to the characters of reference on the drawings, the

numeral 1 designates the boiler proper which is provided with the usual tubes opening into the breeching 2. In ordinary boilers the open top 3 of the breeching near the upper, end thereof causes the greatest vacuum: to be at the upper end only and hence Causes the operation of the upper tubes leaving the lower ones inactive. My improved structure comprises a plate 4; secured from side to side of the breeching2 and disposed in front of the tubes of the boiler, the upper end 6 of said member 4 being spaced a lesser distance from the ends of the boiler tubes than the lower end a, thus causingthe member 4 to be positioned in a slanting manner as shown in the drawings. This makes a greater opening at the bottom where the vacuum is ordinarily less than at the top where it is greater and these distances are proportioned according to the size of the boiler and the volume of the draft. Hence, as will be seen, the plate 4, positioned as described, will per mit of a certain amount of draft passing through the upper endbetween said plate and the face of the boiler and a portion downbelow the end a, thus causing all the tubes to be in operation. The reason for the lower end of the plate 4 being spaced a greater distance from the face of the boiler at the lower end is due to the fact that the tendency to vacuum is less under ordinary circumstances and hence, the necessity for a greater opening. The lower end a of the member i curves upwardly in an inclined manner toward the outer end of the breeching of the boiler, and hence whenthe products of combustion are drawn down around the lower end of the plate 4, this inclined curved end tends to shoot them directly toward the upper outer end of the brecching while those products of combustion which are drawn past the upper end of the plate 4 pass into the Smokestack from the inner upper end of the breeching so that the two drafts are substantially independent and split whereby they will not conflict with each other in:the breeohing so that an equalized amount of draft may be hadboth from the upper and lower tubes without interference from each other.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfils the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice, such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

A device of the character described comend 30f said plate being spaced a distance Patented ug. 4., 191a.

.110 jecting over the end of said tubes, the up'pe'r THOMAS J. KENNEDY.

from the top df'said breeching and also a; distance from said tubes, the lower end of Said'plate beingspaced a'greater distance from said tubes than said upper end is dis- 5 posed, and a curved portion'eurvingsout- Wardly from said tubes on the lower end of said plate, as described.

Witnesses:

STEPHEN N." B EWE'TT, CLARENCE M. SMITH.

lcopies of this patent may be obtained tor fiv'e cents each, by-addressing'the Commissioner 01' Patents, 1

Washington, D. 6.? 

